9931977689 has 2 divisors, whose sum is σ = 9931977690. Its totient is φ = 9931977688.

The previous prime is 9931977667. The next prime is 9931977701. The reversal of 9931977689 is 9867791399.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5025675664 + 4906302025 = 70892^2 + 70045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9931977689 is a prime.

It is not a weakly prime, because it can be changed into another prime (9931977889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4965988844 + 4965988845.

It is an arithmetic number, because the mean of its divisors is an integer number (4965988845).

Almost surely, 2^9931977689 is an apocalyptic number.

It is an amenable number.

9931977689 is a deficient number, since it is larger than the sum of its proper divisors (1).

9931977689 is an equidigital number, since it uses as much as digits as its factorization.

9931977689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46294416, while the sum is 68.

The square root of 9931977689 is about 99659.3080901127. The cubic root of 9931977689 is about 2149.5385841618.

The spelling of 9931977689 in words is "nine billion, nine hundred thirty-one million, nine hundred seventy-seven thousand, six hundred eighty-nine".